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      1 //===-- MCJIT.h - Class definition for the MCJIT ----------------*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 #ifndef LLVM_LIB_EXECUTIONENGINE_MCJIT_H
     11 #define LLVM_LIB_EXECUTIONENGINE_MCJIT_H
     12 
     13 #include "llvm/PassManager.h"
     14 #include "llvm/ExecutionEngine/ExecutionEngine.h"
     15 #include "llvm/ExecutionEngine/RuntimeDyld.h"
     16 #include "llvm/ADT/SmallVector.h"
     17 #include "llvm/Support/raw_ostream.h"
     18 
     19 namespace llvm {
     20 
     21 // FIXME: This makes all kinds of horrible assumptions for the time being,
     22 // like only having one module, not needing to worry about multi-threading,
     23 // blah blah. Purely in get-it-up-and-limping mode for now.
     24 
     25 class MCJIT : public ExecutionEngine {
     26   MCJIT(Module *M, TargetMachine *tm, TargetJITInfo &tji,
     27         RTDyldMemoryManager *MemMgr, CodeGenOpt::Level OptLevel,
     28         bool AllocateGVsWithCode);
     29 
     30   TargetMachine *TM;
     31   MCContext *Ctx;
     32   RTDyldMemoryManager *MemMgr;
     33 
     34   // FIXME: These may need moved to a separate 'jitstate' member like the
     35   // non-MC JIT does for multithreading and such. Just keep them here for now.
     36   PassManager PM;
     37   Module *M;
     38   // FIXME: This really doesn't belong here.
     39   SmallVector<char, 4096> Buffer; // Working buffer into which we JIT.
     40   raw_svector_ostream OS;
     41 
     42   RuntimeDyld Dyld;
     43 
     44 public:
     45   ~MCJIT();
     46 
     47   /// @name ExecutionEngine interface implementation
     48   /// @{
     49 
     50   virtual void *getPointerToBasicBlock(BasicBlock *BB);
     51 
     52   virtual void *getPointerToFunction(Function *F);
     53 
     54   virtual void *recompileAndRelinkFunction(Function *F);
     55 
     56   virtual void freeMachineCodeForFunction(Function *F);
     57 
     58   virtual GenericValue runFunction(Function *F,
     59                                    const std::vector<GenericValue> &ArgValues);
     60 
     61   /// getPointerToNamedFunction - This method returns the address of the
     62   /// specified function by using the dlsym function call.  As such it is only
     63   /// useful for resolving library symbols, not code generated symbols.
     64   ///
     65   /// If AbortOnFailure is false and no function with the given name is
     66   /// found, this function silently returns a null pointer. Otherwise,
     67   /// it prints a message to stderr and aborts.
     68   ///
     69   void *getPointerToNamedFunction(const std::string &Name,
     70                                   bool AbortOnFailure = true);
     71   /// @}
     72   /// @name (Private) Registration Interfaces
     73   /// @{
     74 
     75   static void Register() {
     76     MCJITCtor = createJIT;
     77   }
     78 
     79   static ExecutionEngine *createJIT(Module *M,
     80                                     std::string *ErrorStr,
     81                                     JITMemoryManager *JMM,
     82                                     CodeGenOpt::Level OptLevel,
     83                                     bool GVsWithCode,
     84                                     TargetMachine *TM);
     85 
     86   // @}
     87 };
     88 
     89 } // End llvm namespace
     90 
     91 #endif
     92